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The English Wikipedia has several templates and Lua modules which can format or manipulate strings.In this context a "string" is any piece of text forming part of a page. This help page covers a few useful techniques; look in the navbox below for the full catalogue of templa
The string-search functions in Lua script can run extremely fast, comparing millions of characters per second. For example, a search of a 40,000-character article text, for 99 separate words (passed as 99 parameters in a template), ran within one second of Lua CPU clock time.
Lua patterns deliberately lack the most complex regular expression constructs (to avoid bloating the Lua code base), where many other computer languages or libraries use a more complete set. Lua patterns are not even a subset of regular expressions, as there are also discrepancies, like Lua using the escape character % instead of \, , and ...
Wikipedia:Lua style guide – standards to improve the readability of code through consistency "What do converted templates look like?" (slideshow) Help:Lua debugging – a how-to guide about debugging Lua modules; Help:Lua for beginners – basic tutorial and pointers; Wikipedia:Lua string functions – string performance considerations and limits
Running your code through an IDE is helpful for its text highlighting features, which can help you quickly spot syntax errors. Any IDE with the ability to install a Lua text highlighting plugin should work. This could be as simple as Notepad++ (with Lua selected from the language menu) or as full-featured as Visual Studio Code.
find_character(string,char) returns integer Description Returns the position of the start of the first occurrence of the character char in string. If the character is not found most of these routines return an invalid index value – -1 where indexes are 0-based, 0 where they are 1-based – or some value to be interpreted as Boolean FALSE.
# is the length operator for tables and strings. array [0] = "z"-- Zero is a legal index. print (# array)-- Still prints 4, as Lua arrays are 1-based. The length of a table t is defined to be any integer index n such that t[n] is not nil and t[n+1] is nil ; moreover, if t[1] is nil , n can be zero.
I mentioned the 8/4 input because current Lua source that happens to have tabs (because it was prepared somewhere else and was pasted into the edit window) should be using 8-column tabs (an example being Module:Convert/data), while someone writing a new module in the new CodeEditor will get 4-character column tabs if they press the Tab key. A ...